Dyestuffs containing chromium and process of making same



The new solution,

Patented Sept. 9, 1930 UNITED STATES PATENT F C FRITZ jsTRAU or BASEL, SWITZERLAND; AssIGNoR To socimy or CHEMICAL IN- ,nUsTRY IN- BAsLE, or :easnnswrrznnLAEIn A DYESTUFFS CONTAINING CHROMIUM AND PROBESQ or 'MAkme jsAME No Drawing. Application filed September 17, 192 s, Serial No. 306,618, andin Switzerland September I a i 23,1927;

The presentinvention relates to the manufacture of valuable new dyestuffs-containing chromium. It comprises the process of making these new dyestuffs, the dyestufi'sthemselves, and the material that has been dyed with the new dyestuffs. V y s a The inventionconsists in carefully treating with a'reducing agent a nitrosation (prod not of a chromium compound of the dyestuff made from diazotized l-amino-Q-hydroxynaphthalene-t-sulfonic acid and a-naphthol said dyestuff havingthe formula blue powders which are somewhat easily soluble in water to a green-blue solution, dissolving in caustic soda solution to a pure blue and dyeingwool and silk steel-blue tints ofzexcellent properties of 'fastness.

They may also be used forcoloringyarnishes,

and othermaterials, as Well as themanufacture of further dyestuffs. V i The following example illustrates the in- Vention, the parts being by weight.

EwampZe The dyestuflmade in known manner from j 39.4 parts of the azo-dyestuffs from diazotized 1 amino-2-hydroxynaphthalene .sulfonic acid and a-n'aphthol ofthe formula I SO E water and 25 of 36 40 C. 56 parts of crystallized sodium sulfide.

The Whole-is slowly'warmed, whereby the with other chroming V the alkali sulfide,

products thus "obtained form blackmium compound of the dyestufi from diasulfonic acid and sulfideihasdisappeared as determined by test! Afterneutralization acetic-acid the dyestuff is salted out at'60 Oz, filtered, pressed and dried. V

which somewhat easilysolublein water to] fIt is a black-bluexpowden a green-bluesolution, and'dissolves in caustic sodasolution to apureblue solutiomit dyes a wool and silksteel-hlue tintsflof excellent properties of fastness, 5 p

Similar products aieobmined "with the chromium compounds which maybe made agents, such as'chromium fluoride or chromeacetate or by s'ubstituting othertagents"actingfsimilarly for such as alkali sulfhydrate, alkali polysulfide, ferrous 'fliydroxide, glucose. and the like. a WVhatI claim is 1 1. process for the manufactur'e of new dyestuffs by carefullytreating with a reduc ing agent a product otthe nitrosation ofa chromium compound of the dyestuflj from diazotiz ed 1eamino-2hydroxynaphthalenee l-sulfoiiic acid and a-naphthol said dyestuff having the formula a ,p

- 1 SO sH- i QQ A process for thefmaiiufacture of new dyestuffs by carefully treating with sodium sulfide aproduct ofthe nitrosation of a chrozotized 1 amino 2 hydroxynaphthalene- 4 a-IlZLPlI DhQl said dyestufi' havingtheformula J 3. As new dyestuits the products obtained by carefully treating with a reducing agent a product of the nitrosation of a chromium compound of the azo-dyestufi from diazotized 1-amino-2-hydroxynaphthalene-4-sulfonic acid and oc-lliLPlltllOl said azo-dyestufi having the formula which products form black-blue powders which are somewhat easily soluble in water to a green-blue solution, dissolving in caustic soda solution to a pure blue solution, and dyeing wool and silk steel-blue tints of excellent properties of fastness.

4. As a new dyestuff the product obtained by carefully treating with a reducing agent the product of the nitrosation oi the chromium compound of the azo-dyestufi from diazotized 1 amino 2 -hydroxynaphthalene A sult'onic acid and a-naphthol said azo-dyestuff having the formula made by means of alkali chromite, which product forms a black-blue powder which is somewhat easily soluble in water to a greenblue solution, dissolving in caustic soda solu- 4 tion to a pure blue solution, and dyeing wool and silk steel-blue tints of excellent properties of fastness. 5. The material that has been dyed with the products of claim 3. 6. The material that has been dyed with the product of claim 4:;

In witness whereof I have hereunto signed my name this 6th day of September 1928. FRITZ STRAUB. 

